Integrated metal-insulator-metal capacitor and metal gate transistor

Abstract

An integrated circuit structure is disclosed that comprises a pair of capacitors, each having metal plates separated by an insulator, and metal gate semiconductor transistors electrically connected to the capacitors. The metal gate of the transistors and one of the metal plates of each of the capacitors comprise the same metal level in the integrated circuit structure. More specifically, each of the capacitors comprise a vertical capacitor having an upper metal plate vertically over a lower metal plate and each metal gate of the transistors and each upper metal plate of the capacitors comprise the same metal level in the integrated circuit structure.

Description

1. Field of the InventionThe present invention generally relates to microelectronic circuits, and more particularly to a microelectronic circuit and device having metal-insulator-metal capacitors.2. Description of the Related ArtIn today's dynamic random access memory (DRAM) environment, achieving high density is of the utmost concern. As the DRAM size continues to grow larger, its performance becomes a concern. Therefore, it is critical to improve the performance of the DRAM, especially for short-cycle, high-speed embedded DRAMs. In order to compete with the technological embodiments of static random access memories (SRAMs), there are many performance breakthroughs which must occur to the DRAMs. One such breakthrough is to further reduce the DRAM size. The size of a DRAM macro is about 10 to 15 times smaller than that of SRAM with the same capacity. Moreover, the smaller the size, the less the delay. Unlike conventional stand-alone DRAMs, the size of erasable DRAM (eDRAM) is more d...

AI Technical Summary

Benefits of technology

The planarizing of the first metal layer reduces voids and surface irregularities in the second metal layer. The insulator comprises both a capacitor insulator and a gate insulator. In addition, after forming the sidewall spacers, the invention dopes source and drain regions in the substrate.

Problems solved by technology

Unlike conventional stand-alone DRAMs, the size of erasable DRAM (eDRAM) is more difficult to reduce, which increases the process cost.

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